Cock or valve



(No Modem 7 I C. VER T. POLLOCK.

. 000K 0R VALVE. No. 574,571. Patented Jan. 5, 1897.

I UNITED STATES ATENT FFICE.

CHARLES VER TREESE POLLOCK, OF GREENIVICH, CONNECTICUT.

COCK OR VALVE.

SPECIFICATION forming part of Letters Patent No. 574,571, dated January5, 1897.

Application fil d September 12, 1896. Serial No. 562,286. (No model.)

To all whom, it may concern:

Be it known that I, CHARLES VER 'lnnnsn POLLOOK, a citizen of the UnitedStates, residing at Greenwich, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements in CocksorValves; and I do hereby declare the following to be afull, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertain's to make and use the same.

My invention relates to cocks or valves having revoluble valve-plugs andmy invention consists in the novel means employed for supporting andadjusting the position of the plug within the valve-chamber so as toprevent the plug from working too far down into the valvechamber andbecoming wedged therein, and in the novel construction, combination, andarrangement of the parts of the valve.

Cocks or valves are usually constructed with a tapering or conicalvalve-chamber havin g a corresponding tapering or conical valveplugtherein, the valve-chamber and valveplug being made conical in order toavoid expensive fitting of the surfaces and in order that as thesurfaces of the chamber and plug wear away the plug may be forceddownward into the valve-chamber, so as to always preserve a tight fit.In large valves, particularly where the valve is not in use for longperiods of time, much difficulty has been found with the sticking of thevalve-plug within the valve-chamber, making it sometimes impossible, ornearly so, to turn the valve-plug at all. This is due to the fact thatthe pressure of the gland or the nut by which the plug is held in placeupon the plug produces considerable pressure between the surfaces of thevalve-plug and valve-chamber, so that slight corrosion of these surfacescements the plug and chamber quite firmly together, the pressure of thegland or nut further tending to cause the conical plug to work down intothe conical valve-chamber, so as to fit too tightly therein. To avoidthis difficulty, valves have sometimes been made with cylindricalvalve-chambers and cylindrical valve-plugs. In such valves there is lessdanger of the plug sticking within the valve-chamber, but the fitting ofthe valveplug to the valve-chamber so that the valve may be water-tightunder heavy pressure is adifiicult and expensive matter. Moreover, assoon as the surfaces of the valve-plug and valve-chamber have worn awayslightly the valve is no longer water-tight and can only be made so byfitting a new plug into the chamber. All of these objections I avoid inthe valve herein described, in which both the valve-chamber andvalve-plug have a very slight taper and in which means are provided forsetting the valve-plug upward after it has been pressed into place byscrewing down the gland, so that while the surfaces of the valvechamberand valve-plug are in very close contact there is little or no pressurebetween the surfaces, and therefore less tendency for corrosion tocement the surfaces together, and the plug is prevented absolutely fromgradually working downward into the chamber, while the reduction ofpressure between the surfaces of the valve-plug and valve-chambergreatly reduces the wear on these surfaces,

The objects of my invention are, first, to provide a valve in whichthere shall be no tendency for the plug to stick in the valvechamber orto work down therein, and which shall yet be capable of adjustment fortaking up wear between the surfaces of the valvechamber and valve-plug;second, to so construct this valve that there may be little frictionbetween the surfaces of the valve-chamber and valve-plug, thereby reducing the wear of these surfaces; third, to provide an adj ustablesupport for the valve-plug when within the valve-chamber, and, fourth,to make the valve simple, easy of construction and adjustment, strong,durable, and as inexpensive as possible. These objects are attained inthe cook or valve herein described, and illustrated in the drawingswhich accompany and form a part of this application, in which the samereference-numerals refer to the same or corresponding parts, and inwhich Figure l is a side elevation of the valve, and Fig. 2 is acentralvertical section thereof.

In the drawings, 1 is the casing of the valve, having within it avalve-chamber of slightlyconical shape, within which fits a correspondiugly-shaped valve-plug 2. In the valve-casin g are inlet and outletpassages 3 and 4, havin g ports in the valve-chamber, and the valveplughas a port 5, adapted, when the valveplug is in proper position, toplace the ports of the inlet and outlet passages in communication. Thevalve-plug has a valve-stem 6. The valve-chamber has a cover 7 screwingover its top and having bosses 8 and 0 surrounding the valve-stem.Surrounding the valve-stem 6 is a gland 10, adapted to screw into thebosses S and 9 and having in its lower end a conical recess adapted toreceive the conical top of a ring or washer 11, likewise surrounding thevalve-stem and somewhat loose thereon. The surfaces of the gland 10 andwasher 11 are ground together, and the purpose of using a washer looseon the valvestem rat-herthan a shoulder on the valve-sten1 for the gland10 to bear against is to avoid the necessity of centering such ashoulder accu rately with respect to the valve-plu g. The top of thevalve-plug 2 is recessed to receive the ring 11, so that the verticalheight of the valve maybe as small as possible. Upon the gland 10 is alock-nut 12, and upon the end of the valve-stem U is a suitable handle13, by which the valte-stem and valve-plu g may be rotated.

In the bottom of the valve-casing is a central boss 1i, having acentrallyscrew-threaded opening into which screws a set-screw 15, havinga conical top adapted to fit into a conical depression in the bottom ofthe valveplug 2. Over this boss 14 screws a cap 16, by which waterleaking around the screw 15 may be prevented from escaping.

The operation of adjusting my valve is as follows: The valve-plu g isfirst put within the valve-chamber and the cover 7 and gland 1O turneddown until the valve'plug is seated firmlywithin the valve-chamber. Thegland 10 is then turned backward slightly, and the set-screw 15 isscrewed upward, so as to lift the valve-plug 2 sufficiently to relievethe pressure between the valve-plug and valvechamber. After theposit-ion of the plug within the valve-chamber has been adjusted thegland 10 is again screwed down until it presses firmly against the ring,so as to prevent all leakage of water around the valvestem. The lock-nut12 is then screwed downward, so as to hold the gland in place, and thecap 16 is screwed on over the boss 11.

The valve-plug requires to be lifted only very slightly in order torelieve the pressure between it and the surfaces of the valvechamber,and because of the slight taper of the valveplug and valve -chamber thisslight lifting of the valve-plug leaves the surfaces of the valve-plugand valve-chamber in such close contact that leakage of water isimpossible. The valve-plug being supported and guided entirely, ornearly so, by the setscrew 15 and gland 10, there is little wear of thesurfaces of the plug and valve-chamber, and the set-screw 15 absolutelyprevents the valve-plug from working downward into the valve-chamber.Also, because the valveplug is supported only by the setscrew and gland,the surfaces exposed to friction when the plug is rotated are verysmall, so that there is but little friction in the valve.

If atany time the surfaces of the Valvechamber and valve-plug become soworn that adjustment is desirable, the cap 14 is removed and thelock-nut 12 loosened, the set-screw 15 screwed out slightly and thegland 10 screwed down, so as to force the valve-plug against the screw15. The lock-nut 12 may then be screwed down and the cap 16 put inplace, as before.

Having thus completely described my invention, what I claim, and desireto secure by Letters Patent, is-

1. In a valve, the combination, with a casing having a taperingvalve-chamber and a tapering and revolubly-inounted valve-plug thereinhaving a suitable valvestem by which it may be rotated, and a washersurrounding said stem, of an axially-adjustable gland surrounding saidstem and arranged to press said washer and valve-plug inward, said glandand washer having correspondingly-shaped tapering male and female endsadapted to seat one on the other, whereby the washer may be centeredwith respect to the gland, an d a set-screw engaging the other end ofthe valve-plug at the center thereof, and supporting the same, andlongitudinally adjustable, substantially as described.

2. In a valve, the combination, with a casing having a valve-chamber anda revolublymounted valve-plug therein having a suitable valve-stem bywhich it may be rotated, of a washer surrounding said stem, and anaxiall y-ad j ustable gland surrounding said stem and arranged to presssaid washer inward and against the valve-plug, said gland and washerhaving correspondingly-shaped tapering male and female ends adapted toseat one on the other, whereby the washer may be centered with respectto the gland, substantially as described.

3. In a valve, the combination, with a casing having a valve-chamber anda revolublymounted valve-plug therein having a suitable valve-stem bywhich it may be rotated, of a washer surrounding said stem and fittingwithin a depression of the valve-plug, and an axially-adjustable glandsurrounding said stem and arranged to press said washer inward andagainst the valve-plug, said gland and washer havingcorrespondingly-shaped tapering male and female ends adapted to seat oneon the other, whereby the washer may be centered with respect to thegland, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES YER 'lRllllSll lOLllOCh'.

\Vitnesses:

I. ROSENBERG, HARRY M. MARBLE.

